enzymes function as a catalyst by

lowering the activation of a reaction

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Chem final exam

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Questions 91

Answers

1
what is the correct name for BaF2
barium fluoride
barium difluoride
barium II fluoride
Barium fluorine
2
Which of these formulas corresponds to that of a straight-chain alkane
C5H10
C5H12
C6H12
C7H14
3
what is the pH of a solution that has a [H3O+] = 1.2 x 10^-4
3.92
1.20
7.92
12.80
4
how many monosaccarides are connected to each other in an oligosaccharide
3-9
more than 9
2
1
5
consider the weak acid CH3OOH whose pka = 4.76 and the ph is 8.5
CH3COOH
all of these
CH3COO-
CH3COOH+
6
which of the following elements has a filled valence shell?
P
O
Ar
Se
7
for a reaction to be exothermic or endothermic it is determined by
collision orientation of the molecule
the activation energy
the states of the reactants
the overall loss or gain of energy when the bonds break
8
how many equivalents of Ca +2 are present in a solution that contains 1.02 of CaCO3
1.02 eq
2.00 eq
2.75 eq
2.04 eq
9
what type of interaction is involved in the tertiary structure of a protein
salt bridges
all of the above
hydrogen bonding
disulfide bonds
10
Cobalt is element 27. cobalt -60: how many neutrons and protons are in the nucleus
33 neutrons, 33 protons
27 neutrons, 27 protons
33 neutrons, 27 protons
27 neutrons, 33 protons
11
How many electrons are in the highest energy level of oxygen?
4
6
8
2
12
the compound CH3(CH2)4CH3
heptane
octane
pentane
hexane
13
Which of the following is a metal
Silicon
Chlorine
Hydrogen
Magnesium
14
which of the following is an example of a weak electrolyte
CH3COOH
HCl
NaCl
Na2CO3
15
Specific gravity of olive oil is 0.703. How many grams of oil will fit in a 1.00 L container?
1420 g
0.703 g
703 g
650 g
16
a carbohydrate with 6 carbons and an aldehyde functional group is called
ketopentose
ketohexose
aldohexose
aldopentase
17
enzymes function as a catalyst by
changing the equilibrium constant
increasing the time it takes for a reaction to take place
lowering the overall energy of a reaction
lowering the activation of a reaction
18
what is the molecular geometry of a CO2 molecule
bent
tetrahedral
trigonal planar
linear
19
the atomic number is:
the difference between neutrons and protons
the sum of protons + electrons
the sum of protons + neutrons
the sum of electrons + neurons
20
the following exothermic. which will drive the reaction to the right (towards Products)
a decrease in temperature
the removal of CH4
an increase in temperature
The addition of CO2
21
which of the following would be most soluble in water
CH3CH2OH
CH3CH2CH3
Ch4
Fe
22
what functional groups are present in the following structures CH3-CIIIC-CH2OH
a ketone and an alkyne
alcohol and an alkene
an alcohol and an alkyne
an aldehyde and a ketone
23
What is the coeficient of HCIO4 when the following equation is balanced with smallest whole #
3
1
2
4
24
which of the following blood types is considered to be the universal blood donor
type ab
type o
type a
type b
25
the reaction of calcium and sulfur produces
Ca2S
CaS
Ca2S3
CaS2
26
what is the correct name for ClO7
dichlorine heptoxide
dichloride oxide
chlorine oxide
chloric acid
27
which one of the following is the weakest acid?
HF (Ka= 6.5 x 10^-4)
HCN (Ka= 6.3 x 10^-10)
HNO2 (Ka= 4.5 x 10^-4)
HCIO (Ka = 3.0 x 10^-8)
28
Which of the following is an element?
Sodium
Fire
Carbon Dioxide
Water
29
An ion with an atomic number of 34 and 36 electrons has a ___ charge
+34
-2
-36
+2
30
how many structural isomers are there of C5H12
none
2
3
4
31
which of the following is an example of nonelectrolyte
CH3COOH
Na2SO4
C6H12O6
MgCl2
32
which of the following ions is not isoelectronic with the noble gas neon?
F-
O2-
S2-
Al3+
33
All the different kinds of substances that make up all of the material of the universe
compounds
stuff
matter
Electrolytes
34
Which of the following is a chemical reaction?
melting ice
rusting of iron
slicing a ham
liquefying oxygen
35
Which of the following is a metalloid
Antimony
Bromine
Iron
Copper
36
How many mL of solution are there in 0.0900L
0.0000900 mL
90.0 mL
900 mL
0.90 mL
37
when NaCl dissolves in water, the force of attraction between Na+ and H2O is called?
hydrogen bonding
dipole-dipole
ion-dipole
ion-ion
38
which one of the compounds below is covalent
RbF
NaF
HF
LiF
39
calculate the mass percent by dissolving 10.0 of NaCL in 150.0 g of water
6.67%
6.25%
11.5%
7.01%
40
the area on the enzyme that interacts with the substrate is called the
modular site
allosteric site
regulatory site
active site
41
which type of RNA is involved in the process of transcription
transfer RNA
messenger RNA
Ribosomal RNA
Viral RNA
42
Almost all of the mass of an atom exists in its
electrons
nucleus
first energy level
outermost energy level
43
a thimble of water contains 4.0 x 10^21 molecules. the number of moles of H2O
2.4 x 10^23
2.4 x 10^45
6.6 x 10-23
6.610-3
44
In order to form an octet, an atom of selenium will:
lose 2 electrons
lose 6 electrons
gain 6 electrons
gain 2 electrons
45
which forces stabilize the primary structure of a protein
hydrogen bonding between the carbonyl group and amino group
peptide bonds
dipole dipole
salt bridges
46
a molecule that has both polar and nonpolar parts that can form into a micelle is said to be
an enantiomer
an isomer
hydrophobic
amphipathic
47
a double bond involves the sharing of ___ electrons between the atoms
6
2
8
4
48
What is the mass/volume of a solution thats made from 25 g of glucose in water to make 275 mL .
0.091% m/v
10.9% m/v
8.1% m/v
9.1% m/v
49
which of the following is a storage polysaccharide in plants
cellulose
chitin
amylose
glycogen
50
which of the following nitrogenous bases is found only in RNA
cytosine
uracil
thymine
adenine
51
which of the following compounds cannot exhibit hydrogen bonding
H2O
NH3
HF
CH4
52
how many protons and electrons are there in the calcium ion
20 protons, 19 electrons
20 protons, 20 electrons
20 protons, 18 electrons
20 protons, 22 electrons
53
Add using correct significant digits: 47.462 + 22.53 + 0.11443
70.106
70.10643
70.1
70.11
54
in the benedicts test
a ether is oxidized
a blue precipitate is formed
the copper II ion is reducted
all of the above are true
55
What is the correct symbol for the isotope of copper with a mass number of 63
63/27 Co
63/24 Cr
29/63 Cu
63/29 Cu
56
the type of RNA that contains the anticodon for an amino acid
tRNA
rRNA
mRNA
vRNA
57
increasing the temperature of an enzyme beyond its optimum temperature will
slow down reaction
denature it
have no effect on the enzyme's activity
make the reaction rate increase
58
which type of forces stabilizes the secondary structure of a protein
hydrogen bond between the carbonyl and amino of the peptide
peptide bonds between amino acids
dipole dipole interactions of amino acid side chain
salt bridges between amino acid side chains
59
Which combination contains atoms or ions with complete valence shells
kr, k+, Cu+
p3-, mg2+, He
Ne, O2-, Ca2+
F-, Na+, Ar
60
which has only london dipersion forces as the primary attraction between molecules
CH3CH2CH2CH3
CH3 COOH
CH3CH2OH
H2SO4
61
what is the correct name for a molecule of SO3
monosulfur trioxide
sulfite
sulfur oxide
sulfur trioxide
62
how many electrons are in the highest energy level of strontium
6
8
2
4
63
a homogeneous mixture consists of 12% sucrose, 28% methanol and 60% water. which is the solvent
sucrose
sucrose and methanol
water
methanol
64
An atom of fluorine has how many valence electrons?
2
7
4
6
65
what is the molarity formed by dissolving 10 g NaOH in water to give a final volume of 500 ML
0.5M
9.0M
0.18M
0.02M
66
what is the molecular geometry of a NH3 molecule
bent
trigonal pyramidal
trigonal planar
tetrahedral
67
the ribosome is made of what type of nucleic acid strands
vRNA
rRNA
tRNA
mRNA
68
Which of these hydrocarbons could not be a cycloalkane
C3H6
C6H14
C4H8
C5H10
69
which of the following is a homogeneous mixture
Iron filings and sulfur
Oil and Vinegar salad dressing
Trail mix
Coca Cola
70
what is the v/v concentration of a solution made by adding 10.0 mL of acetone to 92.0 mL of H2O
8.8%v/v
10.9%v/v
9.80%v/v
11.4%v/v
71
a protein that is comprised of two or more protein chains that interact to make the structure
secondary structure
primary structure
tertiary structure
quaternary structure
72
How many O atoms are in one molecule of GaO(NO3)2
4
5
7
3
73
Which of the following is a nonmetal
Magnesium
Sodium
Aluminum
Chlorine
74
cytosine is what type of nitrogenous base
pyrrole
porphyrin
pyrimidine
purine
75
Round the following to 3 significant figures: 546.85
546.9
540
546
547
76
the model the active site of an enzyme is flexible and will mold to the shape of the substrate
induced fit
lock and key
coenzyme
substrate selectivity
77
what is the [H3O+] concentration of a solution that has a pH = 8.37
1.2 x 10^1 M
4.0 x 10-9M
1.0 x 10^-14
2.5 x 10^9
78
what is the mass of 4.22 moles of carbon?
40.0 g
0.351 g
2.54 x 10^24 g
50.7 g
79
in order to have 1/16, how many half-lives must the sample go through to reach this amount
3
4
6
5
80
which of the following is polar
CH4
Co2
so3
SO2
81
the optimum ph for an enzyme such as hexokinase that phosphorylate glucose in the blood
2.0
9.0
7.4
none of the above
82
which of the following formulas is incorrect for cobalt III compound?
CoCl3
Co2O3
CoPO4
CoCO3
83
The neutral atom always contains
the same number of neutrons and electrons
the same number of protons and neutrons
the same number of protons, neutrons, and electrons
the same number of protons and electrons
84
which one of the following is most soluble in hexane, CH3CH2CH2CH2CH2CH3
CH3-O-CH3
CH3CH2OH
CH3CH2CH3
CH3OH
85
which of the following molecules is nonpolar?
NH3
H2O
CH3Cl
CCl4
86
adenine is what type of nitrogenous base
porphyrin
pyrrole
pyrimidine
purine
87
the correct name for CrO3
dichromium trioxide
chromium oxide
chromium III oxide
chromium II oxide
88
which compound contains only covalent bonds
NaCl
NH4OH
Ca3(PO4)2
CH3Cl
89
which of the following is the strongest acid?
pka = 9.20
pka = 4.76
pka= 7.18
pka=10.32
90
which of the following is a polysaccharide
glucose
glycogen
fructose
sucrose
91
which one of these compound is ionic
CH4
H2CO3
NH3
NH4Cl

Chem final exam Flashcards | StudBud

Chem final exam

91 termsStudBud Administration6 plays

#Chem final study guide

Flashcards91 cardsFPractice quizPHost liveL

Questions 91

Answers

1
what is the correct name for BaF2
barium fluoride
barium difluoride
barium II fluoride
Barium fluorine
2
Which of these formulas corresponds to that of a straight-chain alkane
C5H10
C5H12
C6H12
C7H14
3
what is the pH of a solution that has a [H3O+] = 1.2 x 10^-4
3.92
1.20
7.92
12.80
4
how many monosaccarides are connected to each other in an oligosaccharide
3-9
more than 9
2
1
5
consider the weak acid CH3OOH whose pka = 4.76 and the ph is 8.5
CH3COOH
all of these
CH3COO-
CH3COOH+
6
which of the following elements has a filled valence shell?
P
O
Ar
Se
7
for a reaction to be exothermic or endothermic it is determined by
collision orientation of the molecule
the activation energy
the states of the reactants
the overall loss or gain of energy when the bonds break
8
how many equivalents of Ca +2 are present in a solution that contains 1.02 of CaCO3
1.02 eq
2.00 eq
2.75 eq
2.04 eq
9
what type of interaction is involved in the tertiary structure of a protein
salt bridges
all of the above
hydrogen bonding
disulfide bonds
10
Cobalt is element 27. cobalt -60: how many neutrons and protons are in the nucleus
33 neutrons, 33 protons
27 neutrons, 27 protons
33 neutrons, 27 protons
27 neutrons, 33 protons
11
How many electrons are in the highest energy level of oxygen?
4
6
8
2
12
the compound CH3(CH2)4CH3
heptane
octane
pentane
hexane
13
Which of the following is a metal
Silicon
Chlorine
Hydrogen
Magnesium
14
which of the following is an example of a weak electrolyte
CH3COOH
HCl
NaCl
Na2CO3
15
Specific gravity of olive oil is 0.703. How many grams of oil will fit in a 1.00 L container?
1420 g
0.703 g
703 g
650 g
16
a carbohydrate with 6 carbons and an aldehyde functional group is called
ketopentose
ketohexose
aldohexose
aldopentase
17
enzymes function as a catalyst by
changing the equilibrium constant
increasing the time it takes for a reaction to take place
lowering the overall energy of a reaction
lowering the activation of a reaction
18
what is the molecular geometry of a CO2 molecule
bent
tetrahedral
trigonal planar
linear
19
the atomic number is:
the difference between neutrons and protons
the sum of protons + electrons
the sum of protons + neutrons
the sum of electrons + neurons
20
the following exothermic. which will drive the reaction to the right (towards Products)
a decrease in temperature
the removal of CH4
an increase in temperature
The addition of CO2
21
which of the following would be most soluble in water
CH3CH2OH
CH3CH2CH3
Ch4
Fe
22
what functional groups are present in the following structures CH3-CIIIC-CH2OH
a ketone and an alkyne
alcohol and an alkene
an alcohol and an alkyne
an aldehyde and a ketone
23
What is the coeficient of HCIO4 when the following equation is balanced with smallest whole #
3
1
2
4
24
which of the following blood types is considered to be the universal blood donor
type ab
type o
type a
type b
25
the reaction of calcium and sulfur produces
Ca2S
CaS
Ca2S3
CaS2
26
what is the correct name for ClO7
dichlorine heptoxide
dichloride oxide
chlorine oxide
chloric acid
27
which one of the following is the weakest acid?
HF (Ka= 6.5 x 10^-4)
HCN (Ka= 6.3 x 10^-10)
HNO2 (Ka= 4.5 x 10^-4)
HCIO (Ka = 3.0 x 10^-8)
28
Which of the following is an element?
Sodium
Fire
Carbon Dioxide
Water
29
An ion with an atomic number of 34 and 36 electrons has a ___ charge
+34
-2
-36
+2
30
how many structural isomers are there of C5H12
none
2
3
4
31
which of the following is an example of nonelectrolyte
CH3COOH
Na2SO4
C6H12O6
MgCl2
32
which of the following ions is not isoelectronic with the noble gas neon?
F-
O2-
S2-
Al3+
33
All the different kinds of substances that make up all of the material of the universe
compounds
stuff
matter
Electrolytes
34
Which of the following is a chemical reaction?
melting ice
rusting of iron
slicing a ham
liquefying oxygen
35
Which of the following is a metalloid
Antimony
Bromine
Iron
Copper
36
How many mL of solution are there in 0.0900L
0.0000900 mL
90.0 mL
900 mL
0.90 mL
37
when NaCl dissolves in water, the force of attraction between Na+ and H2O is called?
hydrogen bonding
dipole-dipole
ion-dipole
ion-ion
38
which one of the compounds below is covalent
RbF
NaF
HF
LiF
39
calculate the mass percent by dissolving 10.0 of NaCL in 150.0 g of water
6.67%
6.25%
11.5%
7.01%
40
the area on the enzyme that interacts with the substrate is called the
modular site
allosteric site
regulatory site
active site
41
which type of RNA is involved in the process of transcription
transfer RNA
messenger RNA
Ribosomal RNA
Viral RNA
42
Almost all of the mass of an atom exists in its
electrons
nucleus
first energy level
outermost energy level
43
a thimble of water contains 4.0 x 10^21 molecules. the number of moles of H2O
2.4 x 10^23
2.4 x 10^45
6.6 x 10-23
6.610-3
44
In order to form an octet, an atom of selenium will:
lose 2 electrons
lose 6 electrons
gain 6 electrons
gain 2 electrons
45
which forces stabilize the primary structure of a protein
hydrogen bonding between the carbonyl group and amino group
peptide bonds
dipole dipole
salt bridges
46
a molecule that has both polar and nonpolar parts that can form into a micelle is said to be
an enantiomer
an isomer
hydrophobic
amphipathic
47
a double bond involves the sharing of ___ electrons between the atoms
6
2
8
4
48
What is the mass/volume of a solution thats made from 25 g of glucose in water to make 275 mL .
0.091% m/v
10.9% m/v
8.1% m/v
9.1% m/v
49
which of the following is a storage polysaccharide in plants
cellulose
chitin
amylose
glycogen
50
which of the following nitrogenous bases is found only in RNA
cytosine
uracil
thymine
adenine
51
which of the following compounds cannot exhibit hydrogen bonding
H2O
NH3
HF
CH4
52
how many protons and electrons are there in the calcium ion
20 protons, 19 electrons
20 protons, 20 electrons
20 protons, 18 electrons
20 protons, 22 electrons
53
Add using correct significant digits: 47.462 + 22.53 + 0.11443
70.106
70.10643
70.1
70.11
54
in the benedicts test
a ether is oxidized
a blue precipitate is formed
the copper II ion is reducted
all of the above are true
55
What is the correct symbol for the isotope of copper with a mass number of 63
63/27 Co
63/24 Cr
29/63 Cu
63/29 Cu
56
the type of RNA that contains the anticodon for an amino acid
tRNA
rRNA
mRNA
vRNA
57
increasing the temperature of an enzyme beyond its optimum temperature will
slow down reaction
denature it
have no effect on the enzyme's activity
make the reaction rate increase
58
which type of forces stabilizes the secondary structure of a protein
hydrogen bond between the carbonyl and amino of the peptide
peptide bonds between amino acids
dipole dipole interactions of amino acid side chain
salt bridges between amino acid side chains
59
Which combination contains atoms or ions with complete valence shells
kr, k+, Cu+
p3-, mg2+, He
Ne, O2-, Ca2+
F-, Na+, Ar
60
which has only london dipersion forces as the primary attraction between molecules
CH3CH2CH2CH3
CH3 COOH
CH3CH2OH
H2SO4
61
what is the correct name for a molecule of SO3
monosulfur trioxide
sulfite
sulfur oxide
sulfur trioxide
62
how many electrons are in the highest energy level of strontium
6
8
2
4
63
a homogeneous mixture consists of 12% sucrose, 28% methanol and 60% water. which is the solvent
sucrose
sucrose and methanol
water
methanol
64
An atom of fluorine has how many valence electrons?
2
7
4
6
65
what is the molarity formed by dissolving 10 g NaOH in water to give a final volume of 500 ML
0.5M
9.0M
0.18M
0.02M
66
what is the molecular geometry of a NH3 molecule
bent
trigonal pyramidal
trigonal planar
tetrahedral
67
the ribosome is made of what type of nucleic acid strands
vRNA
rRNA
tRNA
mRNA
68
Which of these hydrocarbons could not be a cycloalkane
C3H6
C6H14
C4H8
C5H10
69
which of the following is a homogeneous mixture
Iron filings and sulfur
Oil and Vinegar salad dressing
Trail mix
Coca Cola
70
what is the v/v concentration of a solution made by adding 10.0 mL of acetone to 92.0 mL of H2O
8.8%v/v
10.9%v/v
9.80%v/v
11.4%v/v
71
a protein that is comprised of two or more protein chains that interact to make the structure
secondary structure
primary structure
tertiary structure
quaternary structure
72
How many O atoms are in one molecule of GaO(NO3)2
4
5
7
3
73
Which of the following is a nonmetal
Magnesium
Sodium
Aluminum
Chlorine
74
cytosine is what type of nitrogenous base
pyrrole
porphyrin
pyrimidine
purine
75
Round the following to 3 significant figures: 546.85
546.9
540
546
547
76
the model the active site of an enzyme is flexible and will mold to the shape of the substrate
induced fit
lock and key
coenzyme
substrate selectivity
77
what is the [H3O+] concentration of a solution that has a pH = 8.37
1.2 x 10^1 M
4.0 x 10-9M
1.0 x 10^-14
2.5 x 10^9
78
what is the mass of 4.22 moles of carbon?
40.0 g
0.351 g
2.54 x 10^24 g
50.7 g
79
in order to have 1/16, how many half-lives must the sample go through to reach this amount
3
4
6
5
80
which of the following is polar
CH4
Co2
so3
SO2
81
the optimum ph for an enzyme such as hexokinase that phosphorylate glucose in the blood
2.0
9.0
7.4
none of the above
82
which of the following formulas is incorrect for cobalt III compound?
CoCl3
Co2O3
CoPO4
CoCO3
83
The neutral atom always contains
the same number of neutrons and electrons
the same number of protons and neutrons
the same number of protons, neutrons, and electrons
the same number of protons and electrons
84
which one of the following is most soluble in hexane, CH3CH2CH2CH2CH2CH3
CH3-O-CH3
CH3CH2OH
CH3CH2CH3
CH3OH
85
which of the following molecules is nonpolar?
NH3
H2O
CH3Cl
CCl4
86
adenine is what type of nitrogenous base
porphyrin
pyrrole
pyrimidine
purine
87
the correct name for CrO3
dichromium trioxide
chromium oxide
chromium III oxide
chromium II oxide
88
which compound contains only covalent bonds
NaCl
NH4OH
Ca3(PO4)2
CH3Cl
89
which of the following is the strongest acid?
pka = 9.20
pka = 4.76
pka= 7.18
pka=10.32
90
which of the following is a polysaccharide
glucose
glycogen
fructose
sucrose
91
which one of these compound is ionic
CH4
H2CO3
NH3
NH4Cl